Teacher professional standards provide a fundamental framework for guiding, assessing, and supporting teachers' professional growth and practices with the aim of ensuring that each student has access to rigorous and equitable teaching and learning. The California Standards for the Teaching Profession (CSTP) has been widely influential in California policy and practice. This paper describes how in 2019, leaders from the California Department of Education (CDE) and the Commission on Teacher Credentialing (CTC) decided that the CSTP needed updating to remain relevant and useful. Guided by the Region 15 Comprehensive Center facilitation, CDE and CTC team members joined together as collaborators who led a diverse workgroup and solicited input from educational partners in the field. Ultimately, the process yielded updated standards that reflect the most current research, center equity more strongly, and provide a new structure to support effective implementation.